Question
Four point charge -Q,-q,2q and 2Q are placed, one at each corner of the square. The relation between Q and q for which the potential at the centre of the square is zero is
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Q= -q
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Q=-1/q
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Q=q
-
Q =1/q
Solution
A.
Q= -q
If potential at centre is zero, then
V1 +V2+V3 +V4 = 0
V1 +V2+V3 +V4 = 0
